http://www.kinook.com/UR/Manual/index.htm?template.htm
The defaults are set in Attribute pane (Ctl+4) of the Template for a project. I am guessing you want the default child item to be a Task?
In the Data Explorer window (Ctl+1)- select the Project Item in the Template folder. In the Attributes pane (Ctl+4), change the Attribute " Default Child Template" to Task.